#!/usr/bin/node

const user = {
  name:'cmttt',
  age:20,
  qq:'12345'
};
const log = console.log;

log('name: %s',user.name);
log('Json: %j', user);//json对象
log('age: %d', user.age);

log(`qq : ${user.qq}`);
log('qq:', user.qq);
log('qq: %s ', user.qq);
log('qq:' + user.qq);
console.error('Error');
